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Zircar Zirconia ALK-15 Alumina Knit Textile


Subcategory: Oxide, Aluminum; Oxide

Key Words: Al2O3, aluminum oxide

Material Notes:
Alumina (Al2 O3) has excellent thermal shock resistance, high dimensional stability and good chemical inertness, which makes our alumina fiber products ideal for fast firing cycles up to 1700°C. Our alumina fibers and textiles are made by the same unique Zircar process used for manufacturing yttria-stabilized zirconia cloths and felts. This process yields a high purity alumina fiber with only trace amounts of silica, making it more stable in hydrogen environments than the more commonly found sol-gel alumina fibers that have 3% silica. Our high purity alumina fiber and textiles are offered in six different standard product forms bulk fiber Type ALBF, two felts Types ALF-50 and ALF-100 and three types of knit cloth Types ALK-15, ALW-15 and ALW-30.


  • Excellent Thermal Shock Resistance
  • 99% Pure Alumina
  • Trace Level of Silica (0.09 wt%)
  • Dimensional Stability in Hydrogen
  • Low Thermal Conductivity
  • No Outgassing
  • Six Different Product Formats Offered
  • Available ‘Off the Shelf’

Application Information:

  • Alumina fiber textiles are used as insulation for glass melting furnaces.
  • Alumina bulk fiber, Type ALBF, is used as bulk fill insulation.
  • Alumina fiber textiles are used as insulation for fiber optic furnaces.
  • Alumina fiber textiles are used in SOFC and PEM type fuel cells as gaskets.
  • Alumina fiber cloth is used as insulation in differential scanning calorimeters (DSC’s).

Information provided by Zircar Zirconia.

Available Properties
  • Bulk Density
  • Loss On Ignition
  • Porosity
  • Outgassing - Total Mass Loss
  • Melting Point
  • Shrinkage
  • Tensile Strength per Unit Width
Property Data

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